mine works the same way, coroprate does NOT mean limited slip, mine is the same axle as yours billy, and i get the same thing, the old one tire fire, but only when im in 2WD

 

i know mine works very well. if i take a u-turn to sharp, i can fell the *** end hoop sometimes, since it was rebuilt with the 4.10 it may be even stronger

 

I have never had enough money to actually own one, but in THEORY they give you the best of both worlds. Open differential for normal driving and then flip a switch and you're fully locked. One of these days, I am gonna test drive a Jeep Wrangler Rubicon and see if they are as awesome as I think they can be.

 

I'd choose an Ected locker over the ARB. It doesn't need the pneumatics and it acts as an LSD when not locked. Although, selectable lockers have more moving parts and thus more prone to failure...